diff --git a/src/catchers.rs b/src/catchers.rs
index 371982b..e80d2c3 100644
--- a/src/catchers.rs
+++ b/src/catchers.rs
@@ -1,4 +1,4 @@
-//! The application error catchers
+//! The application error catchers.
 
 use rocket::catch;
 use rocket_contrib::json;
diff --git a/src/graphql.rs b/src/graphql.rs
index 889865f..b4cbe90 100644
--- a/src/graphql.rs
+++ b/src/graphql.rs
@@ -1,3 +1,6 @@
+//! The GraphQL schema implementation.
+//!
+//! Provides the schema with the root query and mutation.
 use crate::models::{
     CompanyInfo, Customer, Invoice, NewCustomer, NewInvoice, NewTimeEntry, TimeEntry,
 };
@@ -8,9 +11,10 @@ use juniper::{object, Context, FieldResult, RootNode};
 
 impl Context for DbConn {}
 
+/// The GraphQL schema.
 pub type Schema = RootNode<'static, Query, Mutation>;
 
-/// The query root.
+/// The GraphQL query root.
 pub struct Query;
 
 #[object(Context = DbConn)]
@@ -61,7 +65,7 @@ impl Query {
     }
 }
 
-/// The mutation root.
+/// The GraphQL mutation root.
 pub struct Mutation;
 
 #[object(Context = DbConn)]
diff --git a/src/handlers.rs b/src/handlers.rs
index 333efbd..cf9716e 100644
--- a/src/handlers.rs
+++ b/src/handlers.rs
@@ -1,4 +1,4 @@
-//! The root handlers
+//! The request handlers.
 
 use crate::graphql::Schema;
 use crate::DbConn;
diff --git a/src/helpers.rs b/src/helpers.rs
index 892ec65..dadb4a6 100644
--- a/src/helpers.rs
+++ b/src/helpers.rs
@@ -1,7 +1,6 @@
-//! Some ORM helpers
+//! Some ORM helpers.
 //!
-//! The macros, types and traits in this module are used to create a simple GraphQL API on top of
-//! models that are in the database.
+//! These macros can be used to shorten repetative ORM queries.
 
 #![allow(unused_macros)]
 
diff --git a/src/main.rs b/src/main.rs
index 5f54cbd..79925df 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -18,11 +18,12 @@ pub mod catchers;
 pub mod graphql;
 pub mod handlers;
 pub mod models;
+/// The application database schema.
 pub mod schema;
 
 // This macro from `diesel_migrations` defines an `embedded_migrations` module containing a
-// function named `run`. This allows the example to be run and tested without any outside setup of
-// the database.
+// function named `run`. This allows the example to be run and tested without any outside setup
+// of the database.
 embed_migrations!();
 
 #[database("stoptime_db")]
diff --git a/src/models.rs b/src/models.rs
index 1397ac5..ecabf5f 100644
--- a/src/models.rs
+++ b/src/models.rs
@@ -1,4 +1,4 @@
-//! The application models
+//! The application models.
 
 mod company_info;
 mod customer;